SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d87363e671d3f14fd6c60f0056b158101429684d7a35729d8b3723afa909c5d' 
  AND token = 'FJ0Kyn7yV0IV6RXDrUY2j4siJYBehIGefqbJXfBu+0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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