Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9e1e48d469508062bf99848b106184bd76e0b4319a4e1dc2256de681cfae01' 
  AND token = 'RCJBA3g3Qlivj01HQHXOjfNiHjny+pir0MiKQWXvGy4=' 
  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"
    }
  }
}