Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '995a8a1755c8cdbd2e98fcbde687143f9f076e029fa94a1216656c02fc6fcecb' 
  AND token = 'r/67QxUMtgkJJERQWtu8a5q6H5GWkQ1XBziBmT9q53c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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