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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'e9bcce926b2572ab6a3c0c8a6556a5683a8acb611be8be0d19aa85b882534d21' 
  AND token = '2qvBhoLa7C3ZX5NKwrqizsxAuNL0oRy5TmQlR+I3BCc=' 
  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"
    }
  }
}