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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '027d0a390fffef9d77bf13eee4f6744162413406a4995f48db30695df1e59e7c' 
  AND token = 'oDhw0+8+LTutTkwjBtay467f4qIo0u7opjkmsxMUh7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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