Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd937a3710961129389e711cf6b80ffc1022b52238aed70c2f68fcd1cd4c8ba69' 
  AND token = 'r/n6WZIhI5vXXrtfJTW0EHUz1vrmbgVODIaCSD9/jAQ=' 
  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"
    }
  }
}