Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f454c3a44fd5cf2f92621a013c8cf0acf9a4403b357775c58ae6697e806a1512' 
  AND token = 'gydk1fily+TTWr0ItVwnbamimKD6qP4+OfiKx76cm3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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