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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ef9562b593dd81c0bb04e276e4482cfe826e1bacaa82c19cc98f93d04f6b9b0' 
  AND token = 'OdG6VPXurhRuJFuO1Me9oc0kFdq3QUvb02ojqZrtNHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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