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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5500e0dc580d12b223f2c900a58f11e0d311c9c296a496701c209278b0cc788' 
  AND token = 'OxSGWeCB1a3/kErCqu5cYOlfb7dOekE7yUtMnMR1KXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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