Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1710c5fb288ff2d1dc3d77b7125212ba624a8f5ca95e15d64e5451fce37e6633' 
  AND token = 'PygdK6LhO03+Ph9V7WcqqcC0PeER6cwasR+Tqkk0aUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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