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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b5cbd37825a74a5ee5d94d3138114e7af013328d0675e3f74ee032b28f1ad089' 
  AND token = 'GPCdicQi3XouLC4cZcT2mZOwM7FK34Seb48FWVc9y0M=' 
  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"
    }
  }
}