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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '6b52a740cf01c002f0cf5db5a1fd53491a9ca710280eb6dde768f608fdf1528b' 
  AND token = 'nOtrp9GZ6i3W5EeO2KdRIyPle9TsnoljfzK+pmhVSOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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