Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f011bcc9d0cc55d34b6319113bb302a16b62b886a500f0326dd3247e155e2a6' 
  AND token = 'WaK6slyl7CbJKfUah09uCndhpyZzh4IK4Wvp7qQAiy0=' 
  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"
    }
  }
}