Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e36eafcc05c9f09ab14474c7d49fc263f53f0fd46c96cd06be29b615c15806f' 
  AND token = 'PTM24fc33s+/fn/U6EOYMz4jHaS6oyD+mjypkRfHGqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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