Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26aaddfc1b9ea85ece53e6a9b08a3d27ca5655bd7dfe3eb2109c564c55cee3a7' 
  AND token = 'WG84GhL4PRhpE0SQ+zEFRCoawjYTyWpMYrGdbQJKGfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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