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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c339c2bdee2d77ba045f61147a48a7bfbf5f72e2e247e99cc2b0a4ec70b2ab' 
  AND token = 'd1Q0qZ8+fqorf8N04RFordf0MLAM1RvM58CWkKfzsuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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