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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'ade86a8418ab50486a027a661e84b5ec71fd51057f3f6926f991fe34d9711f7c' 
  AND token = '7YOHi4Kekrv6dAcyHXVauEKRshA+LE8d3d8WMQi/8Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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