Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74c9d720ba3f904e9299b5411de6b6e07a06c4ed37f05def3ac4fb2f3d9740eb' 
  AND token = 'oXU3pY4dp6YjveW+/V9bMToyjsQVosy/QnXqObgJIc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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