SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '324c574bd02e11db1ba5d76038493eeda371d6165c5d43fb68fcf18ac578ef2a' 
  AND token = 'MgRNWVPUluqWF2UPrDIkAwHAFlPlZKjws8SqbGMiPyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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