Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '606b42f1a39a5df2ca16f39b3a0c7207ae1e578ba907446a909e677b60f856e7' 
  AND token = 'sieQnjOFjqX3ygs3wGJQlHaiD4DDnFmeVnXOZtvzN38=' 
  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"
    }
  }
}