Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '263a7ac29da71a01750a4a2ece0f7ed48ca4a0a73abf51fdde986939ddf32dbf' 
  AND token = 'afICo/EsIPMcvRV7rqd0etqIY3bgpsc6syF9BeGYIEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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