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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69207f7cba47e99007ce12dbc69314630249167579957931e4c2551c3330f04' 
  AND token = 'sfKw5orxJxyrB9aiLD+sWePSvIf76b6bxNtF8jUNHtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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