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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '1c8a3a27dca35ff51ca044e639500b7753b320409b2c970f2a6606fdc7dcfc41' 
  AND token = '6j4ipTjVO3eHO5N6lhjdSHP2iZ0uGadvA9KUjubA5Ro=' 
  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"
    }
  }
}