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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ca0f0772a7cce56902c6b92048f3fd671167d10a1511a5292fcdf14c2a6922' 
  AND token = 'Q+bV9CkjHB60hLqCMZLYF1rZowidckbt/8DuPp//Zxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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