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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '6ebd265f9f8f3048367cbeb1b0201d777cb1121d071eb7d0f19385e56b928d71' 
  AND token = 'qISwdyz+tiZSfwXn+vaUB4gIiZssMFXeQvERpkvmbW8=' 
  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"
    }
  }
}