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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '1ab27877b88ebbd84cfe71cb0cc7b373b63d4d832c36d20b41f905793863afcb' 
  AND token = '8H9rDSkXaF/DElDqn3oKK7wQn/zf+tar1AeIepLJ/AI=' 
  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"
    }
  }
}