Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02681560a246687e1a1a3e09b22e5b9c5b7d3b7ede4c51388de1523e70ca499d' 
  AND token = 'pVFhER/eGW5UmQug4J5e7z07hIfRMj3/Rx7axMyozkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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