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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '861cd26ebbe8af66d48557ad7db30cd99f526ee463969d8fc49a57397ec8b916' 
  AND token = '8jAbe8D9HLK6WwAnWmoDKxwGOk+p4PtbT86JH6srit4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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