Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8177b00f65d2507bfbbd18b4ece9622e2d08b63db65eb2fa78736c752a7d531f' 
  AND token = '8nHHyNdQ56ioLVlKZ51nraRmR+Su58Clpx1/HIAtnSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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