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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3537e3f9167b9f1569362fe86f75c947a9d045790bf0ce7678649e5fc7d87368' 
  AND token = 'LGs/idAuLyL/VHmOKmugGEY5HO/9bz0l/G5S1aPO6d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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