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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '8d63fe16ea860473ce28891565291febbdf4af7cddc5e21604706d91b12d1c32' 
  AND token = '6Qj0qJ+kDVbuMN74S61KM0JPRMjNNBCWpJU34EdKACU=' 
  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"
    }
  }
}