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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a3dc4941104624a31f39844d54d5efdd809a99feb2748d3631e06282ae419cf7' 
  AND token = 'HpJBhfLYw+fADh01BfBl7uYtZCLTf0R737NRbu+rhZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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