SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '93983562dc6bf302c4a861d182b3ae39281ac43ae0b491fcfa9d403377992ac5' 
  AND token = 'S9TR+n0CHloBDR1jJH7zYhBm2T54UYUmePYrmQE+Xw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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