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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09496853101015302341a13da1406593a7adb41dca1d103a05934aa8525071b5' 
  AND token = 'aA8UHr4XZG/gW2PZrs9CjDAE85mXH37q4lkx09PgZf4=' 
  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"
    }
  }
}