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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '499a02ad0376b5d943648669428a6fe6e2e20cd05abbc736676e95bc443941e4' 
  AND token = 'adk5suNkbGZOLMxSTs3k0eJwlFYowoLpX3p2Ov268sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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