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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '6a8d48107a7eeedaf9af4af3308bd3a39c9db933f97b2d00f00452f9ab5d46cc' 
  AND token = '+LsqFJ4kgu05ggGSybNnB9x04DEf1SEEwC4a8VuaCG0=' 
  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"
    }
  }
}