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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da6c9131268ba41135ec65020d4999ca6a75c99f3cca52a6795999624c600e8' 
  AND token = 'trHaeUTmMd5XvsTtTAJE9OTDsweBDFxEPuJoQV7wQec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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