Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a91a72f9189ab23743269600a1f433cbf579393ab90a9bf8091af79420eb0e75' 
  AND token = 'KnXJlGkX5j309ySJYK7USLqDOajlHiKwbodSQ3+1tW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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