Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0003b0a19c2ead51aa5de26ff18b78e10fa6bb9ff13456c8881e2bc73355bd04' 
  AND token = '4XEZl4DMOU8ZI1XDfyF2KFaFxEQk7H7KRYUEOa7srQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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