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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'dfaa6c48e9ddd7f93289f2fcfd2e8e188d3d4d24c4677b9035013bb6fc2c5284' 
  AND token = '5v0/aDPFUHb0LBkX3dnxE2kCqWjrA8j5oMG6d/Ie/7g=' 
  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"
    }
  }
}