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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1839307587621a95d7b407b6790b5c45ed5d4ef8bc9759c37f354b8a08cd6d1' 
  AND token = '8h8h57d4278+xqFBZxl6TZSXAuHsxplXFa4x8s8xyj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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