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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fbdabc8956e7668ccb8cd99ab01fa778f1e7fa1e12aa43934e060e733615fc1' 
  AND token = 'bL7F3cVsEqNtK1z3RixO5U4DHyaE+xlFjyHxVnz0A0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}