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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f22c0f2d6c6298c2fd78ac7df79789e4cb39657fd20e44b6b3214fd0b8c7c3d2' 
  AND token = 'SxWfXkFKphn8G42gwOzfQUcbnF+ANQtKxye8HpHvbzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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