SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf4e0fbd38ce938ef57a8673fcabb0c01278b883552c780c4acb766d752ae22' 
  AND token = 'N4x21o1KPW+h5UHJIVyUAPlB5wyKHRXmn0UbHYwMFug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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