SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '27bb4cc39d6ba7ca085ec605ffb88a33f4d2254b8131436eab1dae3a25f500f0' 
  AND token = 'JfskF6RSkM2XwBzIZUhMuQfDj1rhfpYzovTM2+C9Yso=' 
  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"
    }
  }
}