Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2063075f549ffc09b1b5f2eb58978e47066797ccaa559273623c2d342c74c4b1' 
  AND token = 'KJMrq/t8f4R6hr+EFkQPMgt/K9GrV4bU5DwSyfsfWXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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