Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c72fe46dc5d0becc852c0aea869217dbb93ec66b7f5251ba26a20364f090691' 
  AND token = 'l3P6mCTsqh+mdXNmsp+jwIyfEiaEp0SdQwhMlvixUsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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