SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff1e72cee79f045c73fca1f56c28f267073b0dafd3239613fab3d26c17ad85c1' 
  AND token = 'r2nCGlD6hhgB4yiLK6pj1jyhAaoKX/yxZFuxmJjdZGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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