SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dc59159671eab1eac0d6658404b9b662cfd714b2c872bd19a14a094139d3ad0' 
  AND token = 'jubL37lwMCkq/WVl2TL+2Yb5KNhKZptfthTGoNYHOmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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