Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e2d30e85a62a5d9a5f611335481eacc9dc4ac62aa4594c6876a97e70eb34879' 
  AND token = 'v2RG6HPJlerPxVtIPjPE1Qm4MRxvlFmHToDfUx/hzvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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