Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'fcac7a62404738cb0da3a4be8f598537e2f20b73e4e0a683ceb29ad8cd5b1f5a' 
  AND token = 'WQAOywLlkuNhUvO9lGkHJ3SWJOi1EBQmXeCvyA8on2c=' 
  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"
    }
  }
}