Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ecdec6508f197cae00a374d5ca1a84c0479b9b4a224fd12b1a00b9dd97456ee' 
  AND token = 'nn95KMmCf4ZcMnHTNo1s/appialRlkHu2Gy0POjL4Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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