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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b1ce3fd30f7177d5eb064cb4c041ee440d49777f935eaa92e41742f2ac319bab' 
  AND token = 'prJarIrzrI0GiP9+EP0aV+n4DwxO5E7QFx74bT6Zo4k=' 
  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"
    }
  }
}