SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f743f6a6ba1526785cedfe943fefc9e2cbe826ad8f578f8ad483137165d4f336' 
  AND token = 'cW+yjH7BOQoUxDa1zNdrlpYWyJL8aBVbutahzNOZQo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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