Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ec9e4c49f811d6ed278cabcb6e432fa7edb42ed7ae9c0f0e08078b23e13436' 
  AND token = 'tAprpwEFnHMBnBsMIH4k35reNbnEhRoLAC7FD+lB5OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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