SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8225d5aa33af6a0cc81c9006355d4d16b518dec4c47e2d9cd792df70e8621a8' 
  AND token = 'dJKpUunxOoJwL/3NADCBCVr5sLu+CV6nKmFhprHW0js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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