SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33a35ea450fdb6941fd26eb1e8683c57cd2825d18c8976e19bb8c83d55d2777f' 
  AND token = 'TIa4aQEpnvXGgJYtK/wWX13j/5j8aGG3jBe4u+7qkFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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