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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b4ad38c26478846f06b6e64858b9bd0e48b4f261ae117c3bded16dabeb7046c' 
  AND token = 'P+9Qy+sPZeaoCMHKAiSE13FxdHcJqbQSb8HIW3bPJik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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