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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae17b6109901509fbe3a9a232b9f50ab3a67c3fbf90d2e5914ed4aa096b2281' 
  AND token = 'l8lM2V4WxGe1WZzL6Ub/JB73UxO4p3wBpHClTf7maD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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