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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f52dbd49b67a9753a689360f6b5f2d1f22077463712aa5779452369670dbd27d' 
  AND token = 'VxohOqOQQXEdMMWNYJWrA79anId0GasqHINf2uiTwW0=' 
  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"
    }
  }
}