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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f77a3532e58e48e10f9a947be1fc25c76ad2fffa78347917a0baf5b603be9f6' 
  AND token = 'Pu8Q4Pa97iNLuwtrB0PNE9dgKP2oXqSvmzZv/HsjhN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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