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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a8746c3b7aa5d8831fa8c27a6ee658ba82c54d7161b77d4ae135940bbf40e659' 
  AND token = 'pqoa2/CUi89uRqgn3offeUgZ+3YiOpAne6LaJiyyrAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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