SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c5fb0a2d0fd751869aeffe9f529bd73323955210356b82c445ad7e022b3dd44' 
  AND token = 'gKqCpBUApKZoePW3DuCP22M4VlYup7gvyHe+VlRJflA=' 
  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"
    }
  }
}