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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a07dfc75c575751072f758dc27662e7fcb477cc9b3469957c0b405926a89d9' 
  AND token = 'vkIKTna2O/wC5E+e3uFHu0UCaP/3Afk4gr9KQYrsbLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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