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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a6bf314adc2eb7c17d3286f55b2066ece6c1b274d1734bbf0fc0265647bb97ee' 
  AND token = '3OzfP7Rj2OVbZt2TTEUw/m9Q3dnDLjYDjbRjUlDkNaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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