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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfe83d778dce753e3502f470f6dd5607fbac76e1513eead6f41a898f789f43cc' 
  AND token = 'OLZa2qhTKjPnE+f1KPN8vaCpQwyuecJ58t3WUzdp6kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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