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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d83debb3648b9c0722527913473b3e3fce9550859e9c7819ab13d4f63007459' 
  AND token = 'wnoEDaERsWRH1viTBy5uiUZeTMzM6/5LV4sA4Y5HrJc=' 
  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"
    }
  }
}