Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3549c7fb9dab65eed491a8257f10a37a5f94d975690b438cbe1e3df72d5541' 
  AND token = 'vh98ueYgVkAypZl78tlDR1hDrqhnwFX3sMUwTcPkw14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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