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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'ca74fc5e318c1f4ab4766f8b69fb4e980ea0813230cbe3d9971d0ccc49cdbc45' 
  AND token = '+/ER8wfwawV0eb8DL9rjalyzj3m3WDHQGlUBOiw2gxA=' 
  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"
    }
  }
}