SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c33dacbe46f221f91a5e089b2a519ada2b0b165b0dbc40eb72876851c88241cf' 
  AND token = '4QlUGV5C4KgEP0msHgUw9v+vwDHaaj4vsna71gHp/jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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