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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617b86689b7765ac68edf8293c9271b6d65f45c897352d81032b672e40aebf47' 
  AND token = 'iVJ50tx/uPWFAIW6QX6GZd/r7WxxPCiSZh/vE7gOqM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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