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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '72ba373bc2f997309a4cb7ed9cb81d0ef63da649d2b6687dce70a589242d4b90' 
  AND token = 'bE47HO7OiBiMgMgaa+DlsRXGZ66FkxfKVQ523geT1O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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