SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf2df3a9f8118d16afbc46bd3ad5a047039710ac7eaa78ee581422003a4129df' 
  AND token = 'Y/KBzhaNVCcz/oISe1m+MYXy5i0OB9oxKrmMAeBinG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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