Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a99a809f9d29db235c8584573670012f21ef2aae5bc91d7aefcddc230d3cc9e0' 
  AND token = 'PgzqcbZHAC7F9dieISDlr6Bbf6X+ROoyGYzGP/HdFLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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