Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5ee8b380b311ee8d9acbc2497825412bb16cc9b2e9b078f0c646ae4e90c2d8d' 
  AND token = 'STJEN9yFAUpPAi6qwdd/EVYsAWAoP3nQipGc0hw0KkU=' 
  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"
    }
  }
}