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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '49041d0ebf2742da7d476e13c3f0ca123f448b7ddc0d5d45f8d9115ff8bf8b51' 
  AND token = 'T5Xr1DvXLyi3APIxluw1RaK5XVeXss3uW7V8GBDLYp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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