Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '300fb0be4fc2f5e12f4df62a6737cec6e1e050675e58a37162160370bbab115b' 
  AND token = 'mE0BaU3Z+iPr3qoUfScGBufcRTrzblmX5/eG4s9k8PI=' 
  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"
    }
  }
}