SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58490e3913b0c1fc324d6b7981a5cb710197ae1a54587180af4d731f4452456' 
  AND token = 'whJwe0Q3EBRflgn5vBqQIKpFp+itLlR2G3/w+IC8574=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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