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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc64255f731445d971dc166e3c8a8748df47ed937f280ed79ad247d688feab85' 
  AND token = 'ovHTTu/UEEgf9ci9KOT/EtFaIFonawUDHOScy7ZTl7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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