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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a168fafa939e2014e387a903625d15845f5a99a218892c10410803ced0599bd3' 
  AND token = '7CM8UoeCY+ayZdbv7qb40JRYFr5K8t4ekrUo+kAe92Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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