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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c10eff3f031b7158c3d3819ff293ddbe1a68c2953d0db048f2542d844d09932b' 
  AND token = 'x5s565GAUM3qD3FN2GSKI+pGLyPzL0z6d9PEkN2G6o0=' 
  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"
    }
  }
}