SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73098471cf5a91bd9af2dac79614af85985ed50ddb098eb737486ba083129e13' 
  AND token = 'VFGjJWipnlVXkKq9/Gp/1Ks6X5jtK2Izp1LExlt1Fh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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